Despite it being her first topless nude scene — she showed her backside in Marie Antoinette

— Dunst says she wasn't nervous about doing it and that it was necessary for the story. The docu-drama is loosely based on the true story of New York real estate millionaire/drag queen Robert Durst (Gosling) and his wife, Katie McCarthy (Dunst), who disappears."I was comfortable with it and it just felt more vulnerable, you know?" Dunst says. "There's actually a very good reason for it. And the way we shot it went a lot further, but it ended up getting cut."Melancholia, a sci-fi disaster film that also stars Kiefer Sutherland Charlotte Gainsbourg, is slated for a 2011 release.